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首页> 外文期刊>Materials Science and Engineering >Annealing-dependent microstructure, magnetic and mechanical properties of high-entropy FeCoNiAl_(0.5) alloy
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Annealing-dependent microstructure, magnetic and mechanical properties of high-entropy FeCoNiAl_(0.5) alloy

机译：高退火FeCoNiAl_（0.5）合金的退火相关组织，磁性能和力学性能

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摘要

High-entropy FeCoNiAl_(0.5) alloy was produced and subjected to heat treatment at different temperatures (400, 600, and 800 ℃). The microstructure evolution, magnetic properties and mechanical properties of the alloy were found to be highly dependent on the annealing temperature. The as-cast alloy was composed of FeCoNi-riched matrix (face-centered cubic structure) and the Al-riched region (body-centered cubic structure). After annealed at 400 ℃, Al-Ni-based ferromagnetic rod-like precipitates with body-centered cubic structure were abundantly produced within the matrix, improving saturation magnetization (M_s), coercivity (H_c) and hardness. Increasing the annealing temperature to 600 ℃, not only gave rise to a higher number density of the rod-like precipitates, but also to the formation of some nanosized spherical precipitates. This microstructure feature is more effective in strengthening the material (achieving a peak hardness of -304 HV) but at the same time results in slight declination of M_s and H_c. When the annealing temperature was up to 800 ℃, the most strengthening nanoscale precipitates dissolved, and the hardness of the alloy was reduced accordingly. The main strengthening mechanisms are discussed, and a good combination of mechanical and magnetic properties under optimized heat treatment may be available.
机译：生产高熵FeCoNiAl_（0.5）合金，并在不同温度（400、600和800℃）下进行热处理。发现合金的微观结构演变，磁性能和机械性能高度依赖于退火温度。铸态合金由富FeCoNi的基体（面心立方结构）和富铝的区域（体心立方结构）组成。经400℃退火后，在基体内大量生成以体心立方结构为主的Al-Ni基铁磁棒状析出物，提高了饱和磁化强度（M_s），矫顽力（H_c）和硬度。将退火温度提高到600℃，不仅会导致更高数量密度的棒状沉淀物，而且还会形成一些纳米尺寸的球形沉淀物。这种微观结构特征在增强材料方面更有效（达到-304 HV的峰值硬度），但同时导致M_s和H_c略微偏斜。当退火温度达到800℃时，最强化的纳米级析出物溶解，合金的硬度相应降低。讨论了主要的强化机制，并且可以在优化的热处理条件下很好地结合机械性能和磁性能。

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